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Texas Instruments LM2674N-5.0
- Part No.:
- LM2674N-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2674N-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,732
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Product details
Overview
LM2674N-5.0 from Texas Instruments is a monolithic 500 mA step-down (buck) switching voltage regulator in an 8-pin DIP package, delivering a fixed 5.0 V output with ±1.5% tolerance over line and load, 260 kHz fixed-frequency operation, and up to 90% efficiency at 12 V input/500 mA load. It integrates a 0.25 Ω DMOS power switch, internal frequency compensation, thermal shutdown, and current limiting-designed for compact, high-efficiency DC-DC conversion in industrial power supplies.
For engineers reviewing the LM2674N-5.0 datasheet, LM2674N-5.0 pinout, LM2674N-5.0 application, or LM2674N-5.0 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LM2674N-5.0 implements a synchronous-free buck topology using a patented LMDMOS process, with a fixed 260 kHz oscillator driving an integrated 0.25 Ω DMOS switch. Its internal compensation eliminates external loop components, enabling stable regulation across 8–40 V input while sustaining 500 mA continuous output current.
It features TTL-compatible ON/OFF control (1.4 V turn-on threshold), 50 μA standby current, and full fault protection including cycle-by-cycle current limiting and thermal shutdown. The device operates across −40°C to +125°C junction temperature and requires only five external components: input capacitor, output capacitor, catch diode, inductor, and boost capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over 8–40 V input and 20 mA–500 mA load - ensures stable logic supply without feedback resistor network. |
| Max Output Current | 500 mA continuous - supports single-rail microcontroller, FPGA I/O, or sensor subsystems without external current boosting. |
| Switching Frequency | 260 kHz (±10%) - enables use of low-cost, standard 47–100 μH inductors and reduces EMI compared to sub-100 kHz regulators. |
| Efficiency | 90% typical at VIN = 12 V, IOUT = 500 mA - minimizes board-level heat dissipation; copper traces suffice as heatsink. |
| Input Voltage Range | 6.5 V to 40 V - accommodates unregulated 12 V/24 V industrial rails, automotive battery transients, and wide-input legacy systems. |
| Quiescent Current | 2.5 mA typical (3.6 mA max) - enables low-power operation in always-on monitoring circuits without excessive idle loss. |
| Standby Current | 50 μA typical (150 μA max) with ON/OFF pin low - supports deep-sleep modes in battery-backed or energy-harvested systems. |
Pinout & Package
LM2674N-5.0 is housed in an 8-pin plastic dual in-line package (DIP), with through-hole mounting and 0.3-inch lead spacing. Thermal resistance θJA is 95°C/W with 1 in² PCB copper area.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 6.5–40 V DC; requires ≥22 μF low-ESR tantalum bypass capacitor placed adjacent to pin. |
| 2 (GND) | Power Ground | Common return for input/output capacitors, inductor, and diode; must connect to large copper pour for thermal and noise control. |
| 3 (OUT) | Switch Node | Drives external catch diode anode and inductor; high dv/dt node requiring short, direct routing to minimize EMI and ringing. |
| 4 (FB) | Feedback Input | Not connected for fixed 5.0 V version; internally tied to internal resistive divider - no external components required. |
| 5 (ON/OFF) | Enable Control | TTL-compatible shutdown input; <1.4 V disables regulator (50 μA standby); >2.0 V enables normal operation. |
| 6 (GND) | Signal Ground | Dedicated ground reference for feedback and enable circuitry; recommended to tie to power ground at single point near IC. |
| 7 (BOOST) | Bootstrap Capacitor Terminal | Connects to 0.01 μF ceramic capacitor between OUT and BOOST to gate-drive the internal DMOS switch efficiently. |
| 8 (VOUT) | Regulated Output | Delivers regulated 5.0 V ±1.5%; requires ≥47 μF output capacitance with ≤0.1 Ω ESR for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Patented internal frequency compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity in cost-sensitive designs. |
| 0.25 Ω DMOS output switch | Enables high efficiency (>90%) at 500 mA without external MOSFET - simplifies thermal design and reduces footprint. |
| 260 kHz fixed-frequency operation | Allows use of off-the-shelf, low-cost 47–100 μH shielded inductors - avoids custom magnetics and accelerates prototyping. |
| TTL-compatible ON/OFF control | Supports direct interfacing with microcontroller GPIOs or system power sequencers - no level-shifting circuitry required. |
| Thermal shutdown + current limit | Provides autonomous protection during overload, short-circuit, or inadequate heatsinking - prevents field failures without external sensing. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated 5 V logic rails for digital input/output expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying microcontroller, optocouplers, and level-shifters from 24 V DC bus. Use Value: Delivers 500 mA at 90% efficiency with minimal thermal rise on FR-4, eliminating need for heatsinks in confined DIN-rail enclosures. |
Use Scenario: Generating stable 5 V for microcontroller peripherals (CAN transceivers, EEPROM, sensors) in body electronics modules. IC Role / Device Role / Timing Role: Secondary regulated supply derived from vehicle battery (9–16 V nominal, up to 40 V load dump). Use Value: Withstands 40 V transients and maintains ±1.5% output accuracy across −40°C to +125°C - meets AEC-Q100 stress requirements. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power |
Use Scenario: Providing clean, low-noise 5 V for analog front-end signal conditioning and ADC reference in portable diagnostics equipment. IC Role / Device Role / Timing Role: Isolated buck stage feeding linear post-regulator for ultra-low ripple analog supply. Use Value: Fixed-frequency 260 kHz operation enables predictable EMI filtering; 50 μA standby supports battery backup during AC loss. |
Use Scenario: Converting 12 V wall adapter output to 5 V for USB peripherals, display backlight drivers, and secure element ICs. IC Role / Device Role / Timing Role: Main DC-DC converter powering entire terminal motherboard, including payment interface ICs. Use Value: Requires only 5 external components and standard inductors - reduces BOM cost and accelerates time-to-market for certified retail hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Lower 52 kHz switching frequency; 3.0 A peak switch current; 0.45 Ω RDS(on); no internal compensation - requires external RC network. | Higher output ripple and larger magnetics needed; less suitable for space-constrained designs but more robust under surge conditions. | Select when lower EMI priority outweighs size/efficiency; verify loop stability with external compensation. |
| TPS5430DR | 3.0 A output capability; 500 kHz switching; integrated high-side FET; requires external compensation; 0.13 Ω RDS(on). | Supports higher current loads and faster transient response; demands more complex layout and tighter component tolerances. | Choose for upgraded performance where 500 mA headroom is insufficient or 260 kHz EMI conflicts with system clocks. |
Compared with LM2674N-5.0, LM2574N-5.0 trades efficiency and size for ruggedness and simplicity, while TPS5430DR offers higher current and frequency at the cost of design complexity - LM2674N-5.0 remains optimal for cost-sensitive, thermally constrained 500 mA fixed-output applications.
Availability
LM2674N-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical instrumentation, and point-of-sale terminals requiring stable component supply, long-term manufacturability, and proven reliability in extended temperature environments.
Supply support for LM2674N-5.0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio, engineered specifically for ease-of-use in non-isolated DC-DC buck conversion - prioritizing minimal external components, internal compensation, and broad industrial operating ranges.
FAQ
What is the maximum input voltage rating for LM2674N-5.0?
The absolute maximum input voltage for LM2674N-5.0 is 45 V, but the recommended operating range is 6.5 V to 40 V per the datasheet. Operation above 40 V risks exceeding safe operating area limits during transients, even if average voltage remains within spec. For automotive load-dump scenarios, ensure input clamping or filtering is implemented before the VIN pin of LM2674N-5.0.
Does LM2674N-5.0 require external feedback resistors?
No, LM2674N-5.0 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider setting VOUT to 5.0 V; the FB pin is not connected externally and must remain unpopulated. This eliminates tuning error and improves production consistency versus adjustable versions like LM2674N-ADJ.
Can LM2674N-5.0 be used in surface-mount designs?
LM2674N-5.0 is packaged exclusively in an 8-pin DIP (through-hole) format and is not available in surface-mount variants. For SMT implementations, consider the SO-8 version LM2674MX-5.0 or LLP variant LM2674LDX-5.0 - both share identical electrical specs but differ in thermal performance and assembly process compatibility.
What is the thermal resistance (θJA) of LM2674N-5.0?
The junction-to-ambient thermal resistance (θJA) of LM2674N-5.0 is 95°C/W when mounted on a standard PCB with approximately 1 square inch of copper surrounding the leads. Adding thermal vias or increasing copper area lowers effective θJA, directly improving power handling - e.g., doubling copper area can reduce θJA by ~15–20°C/W.
Is LM2674N-5.0 RoHS compliant and lead-free?
Yes, LM2674N-5.0 is RoHS compliant and lead-free per TI's official product change notices and packaging data. The N-package marking confirms compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and IPC/JEDEC J-STD-033 handling guidelines for lead-free reflow.
LM2674N-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2674N-5.0 FAQ
1.How can I place an order for LM2674N-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674N-5.0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2674N-5.0 reliable?
The price and inventory of LM2674N-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674N-5.0 is usually 5 days.
3.What payment methods are accepted for LM2674N-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674N-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674N-5.0?
LM2674N-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674N-5.0 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2674N-5.0?
For technical support, including LM2674N-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674N-5.0 requirements.
6.How does Aetrix verify that LM2674N-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2674N-5.0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2674N-5.0 meets industry standards.
7.What is the process for return or replacement of LM2674N-5.0?
All LM2674N-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2674N-5.0, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2674N-5.0 part is unused and in its original packaging.
Return procedure for LM2674N-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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